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APE

Advanced Photoelectric Effect experiments

The APE concept is based on a state-of-the-art surface science laboratory as a support facility for advanced spectroscopies at two distinct beamlines using polarized synchrotron radiation in the ultraviolet and soft X-ray range from the Elettra storage ring. APE is a facility for spectroscopic investigation of solid surfaces and nanostructured matter for which the sample preparation and survey represent crucial and integral part of the experiment. For this reason a number of spectroscopic techniques (ARPES (with new VG Scienta DA30 analyzer and in spin-resolved mode), XAS, XMCD/LD, XPS, Mott magnetometry) is coupled with sophisticated off-line preparation/growth and characterization tools (atomically resolved STM, LEED-Auger, magneto-optical Kerr effect).

Ubiquitous formation of bulk Dirac cones and topological surface states from a single orbital manifold in transition-metal dichalcogenides

We demonstrate how various states that occur in transition metal dichalcogenides naturally arise within a single p-orbital manifold as a general consequence of a trigonal crystal field, and as such can be expected across a large number of compounds. M.S. Bahramy et al., Nature Materials 17, 21-28 (2018)

Engineering and enhancing the breaking of inversion symmetry in solids is a key goal in condensed-matter physics and materials science because it can be used to stabilize states that are of fundamental interest and also have potential practical applications.V. Sunko et al., Nature 549, 492–496 (2017)

Evidence for a Strong Topological Insulator Phase in ZrTe5

The complex electronic properties of ZrTe5 have recently stimulated in-depth investigations that assigned this material to either a topological insulator or a 3D Dirac semimetal phase. Here we report a comprehensive experimental and theoretical study of both electronic and structural properties of ZrTe5, revealing that the bulk material is a strong topological insulator.
G. Manzoni et al., PRL 117, 237601 (2016)

Manipulating the Topological Interface by Molecular Adsorbates: Adsorption of Co-Phthalocyanine on Bi2Se3

Topological insulators are a promising class of materials for applications in the field of spintronics. New perspectives in this field can arise from interfacing metal–organic molecules with the topological insulator spin-momentum locked surface states, which can be perturbed enhancing or suppressing spintronics-relevant properties such as spin coherence.
M. Caputo et al.,Nano Lett., 2016, 16 (6), 3409–3414 (2016), DOI: 10.1021/acs.nanolett.5b02635

Layer Dependent Quantum Cooperation of Electron and Hole States in the Anomalous Semimetal WTe2

We report angle- and spin-resolved photoemission spectroscopy of WTe2 single crystals, through which we disentangle the role of W and Te atoms in the formation of the band structure and identify the interplay of charge, spin and orbital degrees of freedom.

New strategy for the growth of complex heterostructures based on different 2D materials

Tungsten disulfide (WS2) monolayers have been synthesized under ultra high vacuum (UHV) conditions on quasi-free-standing hexagonal boron nitride (h-BN) and gold deposited on Ni(111). We find that the synthesis temperature control can be used to tune the WS2 structure.

Giant Rashba-Type Spin Splitting in Ferroelectric GeTe(111)

The Rashba effect as an electrically tunable spin-splitting is anticipated to be the key for semiconductor-based spintronics. It has been pursued in semiconductor heterostructures, where advanced experiments found tunable spin signals at low temperature.

APE within Demonstrator

From 2013 APE became an integral part of the NFFA-Trieste that allowed for the integration of an extra suite of growth and analysis chambers with the APE beamlines. The integral setup will become an open access facility for sample growth, sample characterization and advanced on-line spectroscopic characterization, including spin-resolved ARPES (see VESPA in Journal of Synchrotron Radiationa) that was also implemented within NFFA.

Please refer to our article published in Journal of Synchrotron Radiation.

Experimental techniques

User Area

Proposal Submission

We invite users and collabrators todiscuss their proposalswith the beamline local contactswell in advancebefore the submission deadline. This is crucial for a careful assesment of the experiment feasibility and may lead to improvements in the proposed experimental plan.

Call for proposals

The deadline for proposal submission for beamtime allocation from January 1st to June 30th, 2019 will be September 17th, 2018.